/Engine/Plugins/Runtime/RigVM/Source/RigVM/Public/RigVMCore/RigVMRegistry.h
Notifies other system that types have been added/removed, and template permutations have been updated.
[FOnRigVMRegistryChanged](API\Plugins\RigVM\RigVMCore\FRigVMRegistry\FOnRigVMRegistryChanged) & OnRigVMRegistryChanged()